From 54342d8b8343b918a69ee973b3c55378236af712 Mon Sep 17 00:00:00 2001 From: Jean Delvare Date: Fri, 17 Oct 2008 17:51:15 +0200 Subject: [PATCH] hwmon: (lm78) Prevent misdetection of Winbond chips The LM78 detection is relatively weak, and sometimes recent Winbond chips can be misdetected as an LM78. We have had repeated reports of this happening. We have an explicit check against this for the ISA access, do the same for I2C access now. Signed-off-by: Jean Delvare --- drivers/hwmon/lm78.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/hwmon/lm78.c b/drivers/hwmon/lm78.c index ec601bbf91b9c..f284ecbb9ca80 100644 --- a/drivers/hwmon/lm78.c +++ b/drivers/hwmon/lm78.c @@ -613,6 +613,12 @@ static int lm78_detect(struct i2c_adapter *adapter, int address, int kind) err = -ENODEV; goto ERROR2; } + /* Explicitly prevent the misdetection of Winbond chips */ + i = lm78_read_value(data, 0x4f); + if (i == 0xa3 || i == 0x5c) { + err = -ENODEV; + goto ERROR2; + } } /* Determine the chip type. */ -- 2.39.5